Witness: Juarez, Libya, Showcase, 9.35pm

THE brutal, bloody and confusing reality of war comes into sharp focus in this new HBO documentary series about war photographers. Both the photographs and the video footage are confronting, as you would expect, but it's a lot more than a horrific slide show. The series, executive-produced by Michael Mann, allows the photographers to show what day-to-day life in a war zone is really like, and explains what drives them to risk their lives time and again. Even more fascinating are the interviews with locals who explain what is happening and why; they provide background and depth you don't always get in day-to-day media coverage. Tonight's first instalment follows American photographer Eros Hoagland around the Mexican border city of Juarez as he documents the unrelenting violence the drug war has brought and learns more about its origins. The second instalment follows another American, Michael Christopher Brown, as he returns to Libya and finds the country still chaotic and bitterly divided along racial, tribal and political lines.

Kings Cross ER, CI, 7.30pm

JUST when you thought it couldn't get any more compelling, in comes a man writhing in agony after having acid thrown in his face and being beaten with a hammer. The staff at Sydney's St Vincent's Hospital have no time to wonder how someone could do such a thing to another person - they have to leap into action to ensure he won't be blinded and his throat doesn't swell up and suffocate him, while assessing his head injury and trying to supply pain relief that's effective without killing him. Gobsmacking.

AFI's Master Class: The Art of Collaboration, TCM, 7.35pm

A fascinating discussion in which Steven Spielberg and composer John Williams explain to a film-student audience how and why they have worked together for 40 years, and the role and effect of music in film.

Hard Time, National Geographic, 7.30pm

The compelling prison-documentary series goes behind bars in Las Vegas.

Chicago Fire, Fox8, 8.30pm

Firefighter drama with Jesse Spencer.